Electronic properties of free-standing TiO2 nanotube arrays fabricated by electrochemical anodization

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题名:	Electronic properties of free-standing TiO2 nanotube arrays fabricated by electrochemical anodization
作者:	林進榮;Chen, Chi Liang;Dong, Chung-Li;Chen, Chia-Hao;Wu, Jen-Wei;Lu, Ying-Rui;Lin, Chin-Jung;Ya Hsuan Liou, Sofia;Tseng, Chuan-Ming;Kumar, Krishna;Wei, Da-Hua;Guo, Jinghua;Chou, Wu-Ching;Wu, Maw-Kuen
贡献者:	工學院環境工程研究所
日期:	2015-07-16
上传时间:	2026-04-23 15:02:25 (UTC+8)
出版者:	Royal Society of Chemistry;England
摘要:	摘要： Nanotubular TiO 2 has attracted considerable attention owing to its unique functional properties, including high surface area and vectorial charge transport along the nanotube, making it a good photocatalytic material. Anodic TiO 2 -nanotube (TiNT) arrays on a Ti foil substrate were prepared by electrochemical anodic oxidation and SEM/HRTEM/XRD analyses have suggested that the walls of TiO 2 tubes are formed from stacked [101] planes (anatase). Both HRTEM and XRD indicate an interplanar spacing of d 101 = 0.36 nm in the wall structure. Despite the large amount of work done on nanotube synthesis, a thorough investigation of the electronic and atomic structures of free-standing TiNT arrays has not yet been carried out. X-ray absorption spectroscopy (XAS), resonant inelastic X-ray scattering (RIXS) and scanning photoelectron microscopy (SPEM) are employed herein to examine the electronic and atomic structures at the top and bottom of TiNT arrays. These analyses demonstrate the presence of mixed valence states of the Ti ions (Ti 3+ and Ti 4+ ) and a structural distortion at the bottom cap region of the TiNT. Additionally, the results obtained herein suggest the formation of a defective anatase phase at the bottom cap barrier layer between the Ti foil substrate and TiNT during the growth of electrochemically anodized nanotubes. Different electronic structures between the top and bottom of TiNT revealed by XAS, SPEM, and RIXS. 其他題名： Phys Chem Chem Phys 出版者： England 出版日期： 2015-09-14 出處： Physical chemistry chemical physics : PCCP, 2015-09, Vol.17 (34), p.2264-2271 資源來源： Royal Society of Chemistry 識別號： ISSN: 1463-9076 識別號： EISSN: 1463-9084 識別號： DOI: 10.1039/c5cp02888d 識別號： PMID: 26234367
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